Наверняка вы замечали, что в Python есть удобная функция для получения переменной окружения
os.getenv(NAME)
И её "сестра" для создания или изменения переменных окружения
os.putenv(NAME, VALUE)
Но почему-то putenv() не работает как должно. Энвайромент не обновляется!
os.putenv('MYVAR', '1')
print(os.getenv('MYVAR'))
... и ничего 😴
Почему так?
На самом деле энвайромент обновляется, но это значение не добавляется в словарь os.environ.
Откройте исходник функции os.getenv(). Это просто шорткат для os.environ.get()
В то время как putenv() это built-in С-функция.
Словарь os.environ (или точней класс из MutableMapping) создаётся из энвайромента в момент инициализации. Функция putenv() самостоятельно его не изменяет.
В тоже время, когда вы создаёте или изменяете ключ в os.environ, автоматически вызывается putenv() в методе __setitem__().
То есть, технически putenv() всё делает верно, но в os.environ это не отражается. Можно проверить так:
>>> os.putenv('MYVAR', '123')
>>> os.system('python -c "import os;print(os.getenv(\'MYVAR\'))"')
123
Я объявил переменную в текущем процессе и вызвал дочерний процесс, который её унаследовал и получил в составе os.environ.
Аналогично при удалении переменной вызывается еще одна built-in функция unsetenv(), удаляющая переменную из системы.
Итого
▫️ Удобней всего явно обновлять переменные через os.environ
▫️ Есть способ неявно создать/удалить переменную через putenv/unsetenv, что не повлияет на os.environ но изменит энвайромент и передаст изменения сабпроцессам. Но так лучше не делать!
▫️os.environ это просто обертка для built-in функций putenv() и unsetenv().
#basic
#Topic: 📌🏙Town and City🌆📌
Ten useful collocations, phrasal verbs and expressions for speaking (+definitions)
🖇to close down~ to stop doing business
🖇to get around ~ to travel around
🖇high-rise flats ~ multi-story apartments
🖇office block ~ a large building that contains offices
🖇pavement cafe ~ cafes with tables outside on the pavement
🖇residential area ~ an area where people live
🖇shopping malls ~ large indoor shopping centres
🖇sprawling city ~ a city that has grown over time and which covers a wide area
🖇upmarket shops ~ expensive fashionable shops
🖇public spaces ~ areas in a town or city that are open to the public
Prepared by Mr Andrews
👉@IELTS_with_Steven👈
🔹Obstacle: a thing that blocks one's way or prevents or hinders progress.
🔹Breakthrough: an important development that may lead to an achievement or agreement (make/achieve a breakthrough)
🔹Scrape through (an exam): only just succeed in passing an exam.
🔹Make a go of sth: (inf) make sth succeed specially a business or marriage
➕➕➕➕➕➕➕➕➕➕➕
⚜Tellus about your experiences in this regard and try to use the abovewords and expression in your writing.
#Topic
#Teamjimmy
@Sirjimmy
🔸Outstanding (adj) exceptionally good.
🔹Bias (n) A concentration on or interest in one particular area or subject.
🔸To rise to stardom (expression): to become famous.
🔹Public figure (n): a well-known and notable person.
🔸Paparazzi (n) a freelance photographer, especially one who takes candid pictures of celebrities for publication.
➕➕➕➕➕➕➕➕➕➕➕
⚜Tellus about your experiences in this regard and try to use the abovewords and expression in your writing.
#Topic
#Teamjimmy
@Sirjimmy
🎙🌀 Speaking Activity 🌀🎙
Genetic engineering is an important issue in modern society.
Some people think that it will improve people’s lives in many ways.
Others feel that it may be a threat to life on earth.
⚜️Please discuss on both opinions and tell us about your experiences in this regard.
#Topic
#speaking
#Essay#IELTS
#Teamjimmy
@Sirjimmy
It is an educational group for English learners of different levels, from beginners till advanced( who speak fluently). How we practice English here: 1) 👩🏫”every”day SPEAKING topic is pinned,to find it here press #topic.To take part in it, find the topic, press on it- reply and answer the questions by giving the full answer (not short), essay or a speech presentation by recording your voice, then tag admins or some members who can check your pronunciation or grammar mistakes. You can also find here a speaking partner and practice together by exchanging different opinions, healthy debates, ask extra questions . 2) 👨🏫 LISTENING skills (quiz) press #test_of_theday or #listening_quiz or #audio 3)👩🏫learn and make sentences with new IDIOMS and WORDS of the day, press #idiom_of_the_day#test_of_the_day or #word_of_the_day. Whenever u need some GRAMMAR tips press #grammar_in_brief, SPELLING press #spelling or #common_mistakes4) On Sundays PRONUNCIATION class at 7pm Iranian time. The host is an American professional university teacher- Fatima g. 5) 👩🏫for any assistance ask ADMINS @SB838@Scud21 6) 👨🏫read and record in order to practice your PRONUNCIATION skills and fluency press #readrecord. Press reply, read text and record your voice 7) 👩🏫 Don’t forget to check our GROUP FILES files- downloaded books, curriculums, useful information( music, vocal messages of other members,photos), 8) 👨🏫 CHAT with people from Ireland, Iran,Yemen, India, Brazil,Uzbekistan, Iraq, , Indonesia, Korea, Africa, Turkey, UAE etc. and practice your English. Try to start your conversation politely with a neutral phrase: Hello guys, I’m...... a new member, from...... Nice to meet you. 9) 👩🏫 when we have some free time, we play a game which is called- Crocodile 🐊- when one member is a host who sees the word, gives some hints( explains this words without naming it) and other members guess the word by typing it in chat. So you can practice reading , listening, writing, grammar, speaking
#Start#contents#index#mark
This channel publishes groups and channels according to a main directory and several subject sub-directories for index search
The search keywords are as follows:
One type of keywords:
Nine categories of first-level keywords
Two types of keywords:
Second-level keywords + geographic region + language family
1. Telegraph #telegram#Promotion
#Group#channel#robot
#Search#index#navigation
2. Resources #Resources#Share
#Sharing#Welfare#moive#music#Books
3. Broadcasting #Broadcasting
#message#info#news#blog
4. Chat category #Chat
#chitchat#communication#city#area
#Chinese#English#language#country
#Mainland#HongKong#Taiwan
5. Computer category #Computer
#Hardware#software#VPN#programming
6. Life category #life
#Entertainment#Game#Funny#Anime
#Live#tourism
7. Subjects #Subjects
#Interest#hobbies#topic
8.Industry #Industry#business
9.To be classified
#notes Unclassified